projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 09119a00 MK |
1 | ;------------------------------------------------------------------------------ ;\r |
| 2 | ; Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>\r | |
| 3 | ; This program and the accompanying materials\r | |
| 4 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
| 5 | ; which accompanies this distribution. The full text of the license may be found at\r | |
| 6 | ; http://opensource.org/licenses/bsd-license.php.\r | |
| 7 | ;\r | |
| 8 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 9 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 10 | ;\r | |
| 11 | ; Module Name:\r | |
| 12 | ;\r | |
| 13 | ; SmiException.asm\r | |
| 14 | ;\r | |
| 15 | ; Abstract:\r | |
| 16 | ;\r | |
| 17 | ; Exception handlers used in SM mode\r | |
| 18 | ;\r | |
| 19 | ;-------------------------------------------------------------------------------\r | |
| 20 | \r | |
| 21 | .686p\r | |
| 22 | .model flat,C\r | |
| 23 | \r | |
| 24 | EXTERNDEF gcStmPsd:BYTE\r | |
| 25 | \r | |
| 26 | EXTERNDEF SmmStmExceptionHandler:PROC\r | |
| 27 | EXTERNDEF SmmStmSetup:PROC\r | |
| 28 | EXTERNDEF SmmStmTeardown:PROC\r | |
| 29 | \r | |
| 30 | CODE_SEL = 08h\r | |
| 31 | DATA_SEL = 20h\r | |
| 32 | TSS_SEL = 40h\r | |
| 33 | \r | |
| 34 | .data\r | |
| 35 | \r | |
| 36 | gcStmPsd LABEL BYTE\r | |
| 37 | DB 'TXTPSSIG'\r | |
| 38 | DW PSD_SIZE\r | |
| 39 | DW 1 ; Version\r | |
| 40 | DD 0 ; LocalApicId\r | |
| 41 | DB 05h ; Cr4Pse;Cr4Pae;Intel64Mode;ExecutionDisableOutsideSmrr\r | |
| 42 | DB 0 ; BIOS to STM\r | |
| 43 | DB 0 ; STM to BIOS\r | |
| 44 | DB 0\r | |
| 45 | DW CODE_SEL\r | |
| 46 | DW DATA_SEL\r | |
| 47 | DW DATA_SEL\r | |
| 48 | DW DATA_SEL\r | |
| 49 | DW TSS_SEL\r | |
| 50 | DW 0\r | |
| 51 | DQ 0 ; SmmCr3\r | |
| 52 | DQ _OnStmSetup\r | |
| 53 | DQ _OnStmTeardown\r | |
| 54 | DQ 0 ; SmmSmiHandlerRip - SMM guest entrypoint\r | |
| 55 | DQ 0 ; SmmSmiHandlerRsp\r | |
| 56 | DQ 0\r | |
| 57 | DD 0\r | |
| 58 | DD 80010100h ; RequiredStmSmmRevId\r | |
| 59 | DQ _OnException\r | |
| 60 | DQ 0 ; ExceptionStack\r | |
| 61 | DW DATA_SEL\r | |
| 62 | DW 01Fh ; ExceptionFilter\r | |
| 63 | DD 0\r | |
| 64 | DQ 0\r | |
| 65 | DQ 0 ; BiosHwResourceRequirementsPtr\r | |
| 66 | DQ 0 ; AcpiRsdp\r | |
| 67 | DB 0 ; PhysicalAddressBits\r | |
| 68 | PSD_SIZE = $ - offset gcStmPsd\r | |
| 69 | \r | |
| 70 | .code\r | |
| 71 | ;------------------------------------------------------------------------------\r | |
| 72 | ; SMM Exception handlers\r | |
| 73 | ;------------------------------------------------------------------------------\r | |
| 74 | _OnException PROC\r | |
| 75 | mov ecx, esp\r | |
| 76 | push ecx\r | |
| 77 | call SmmStmExceptionHandler\r | |
| 78 | add esp, 4\r | |
| 79 | \r | |
| 80 | mov ebx, eax\r | |
| 81 | mov eax, 4\r | |
| 82 | DB 0fh, 01h, 0c1h ; VMCALL\r | |
| 83 | jmp $\r | |
| 84 | _OnException ENDP\r | |
| 85 | \r | |
| 86 | _OnStmSetup PROC\r | |
| 87 | ;\r | |
| 88 | ; Check XD disable bit\r | |
| 89 | ;\r | |
| 90 | xor esi, esi\r | |
| 91 | mov eax, gStmXdSupported\r | |
| 92 | mov al, [eax]\r | |
| 93 | cmp al, 0\r | |
| 94 | jz @StmXdDone1\r | |
| 95 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
| 96 | rdmsr\r | |
| 97 | mov esi, edx ; save MSR_IA32_MISC_ENABLE[63-32]\r | |
| 98 | test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]\r | |
| 99 | jz @f\r | |
| 100 | and dx, 0FFFBh ; clear XD Disable bit if it is set\r | |
| 101 | wrmsr\r | |
| 102 | @@:\r | |
| 103 | mov ecx, MSR_EFER\r | |
| 104 | rdmsr\r | |
| 105 | or ax, MSR_EFER_XD ; enable NXE\r | |
| 106 | wrmsr\r | |
| 107 | @StmXdDone1:\r | |
| 108 | push esi\r | |
| 109 | \r | |
| 110 | call SmmStmSetup\r | |
| 111 | \r | |
| 112 | mov eax, gStmXdSupported\r | |
| 113 | mov al, [eax]\r | |
| 114 | cmp al, 0\r | |
| 115 | jz @f\r | |
| 116 | pop edx ; get saved MSR_IA32_MISC_ENABLE[63-32]\r | |
| 117 | test edx, BIT2\r | |
| 118 | jz @f\r | |
| 119 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
| 120 | rdmsr\r | |
| 121 | or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM\r | |
| 122 | wrmsr\r | |
| 123 | @@:\r | |
| 124 | \r | |
| 125 | rsm\r | |
| 126 | _OnStmSetup ENDP\r | |
| 127 | \r | |
| 128 | _OnStmTeardown PROC\r | |
| 129 | ;\r | |
| 130 | ; Check XD disable bit\r | |
| 131 | ;\r | |
| 132 | xor esi, esi\r | |
| 133 | mov eax, gStmXdSupported\r | |
| 134 | mov al, [eax]\r | |
| 135 | cmp al, 0\r | |
| 136 | jz @StmXdDone2\r | |
| 137 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
| 138 | rdmsr\r | |
| 139 | mov esi, edx ; save MSR_IA32_MISC_ENABLE[63-32]\r | |
| 140 | test edx, BIT2 ; MSR_IA32_MISC_ENABLE[34]\r | |
| 141 | jz @f\r | |
| 142 | and dx, 0FFFBh ; clear XD Disable bit if it is set\r | |
| 143 | wrmsr\r | |
| 144 | @@:\r | |
| 145 | mov ecx, MSR_EFER\r | |
| 146 | rdmsr\r | |
| 147 | or ax, MSR_EFER_XD ; enable NXE\r | |
| 148 | wrmsr\r | |
| 149 | @StmXdDone2:\r | |
| 150 | push esi\r | |
| 151 | \r | |
| 152 | call SmmStmTeardown\r | |
| 153 | \r | |
| 154 | mov eax, gStmXdSupported\r | |
| 155 | mov al, [eax]\r | |
| 156 | cmp al, 0\r | |
| 157 | jz @f\r | |
| 158 | pop edx ; get saved MSR_IA32_MISC_ENABLE[63-32]\r | |
| 159 | test edx, BIT2\r | |
| 160 | jz @f\r | |
| 161 | mov ecx, MSR_IA32_MISC_ENABLE\r | |
| 162 | rdmsr\r | |
| 163 | or dx, BIT2 ; set XD Disable bit if it was set before entering into SMM\r | |
| 164 | wrmsr\r | |
| 165 | @@:\r | |
| 166 | \r | |
| 167 | rsm\r | |
| 168 | _OnStmTeardown ENDP\r | |
| 169 | \r | |
| 170 | END\r |